Question

gravitational force
essential questions:

1. what evidence do we have that the direction of earths gravitational force is downward, toward the center of earth?
2. is the force of gravity the same in all locations on earth?

reflect on the essential questions before you dive in...

1. if you were quizzed today, which questions would you know the answers to already?
2. which questions would you need to learn more about to answer confidently?

Explanation:

1. For the reflection questions:

• Question 1: Most people can answer the first essential question (evidence for downward gravity toward Earth's center) from everyday observations like objects falling toward the ground, water flowing downhill, and the fact that we stay anchored to the Earth's surface instead of floating away.
• Question 2: Many people would need to learn more to confidently answer the second essential question (whether gravity is the same everywhere on Earth), as this requires knowledge of Earth's non-spherical shape, altitude differences, and local geological variations that affect gravitational acceleration.

1. For the essential questions:

• Question 1: Observable evidence includes all released objects accelerating toward the ground (not sideways or upward), water always seeking the lowest elevation (flowing downhill), and the way plumb lines hang directly toward the Earth's interior, which aligns with the center of the planet.
• Question 2: No, the force of gravity is not the same in all locations on Earth. Gravity is slightly weaker at higher altitudes, stronger near the poles (since Earth is an oblate spheroid, poles are closer to the core), and varies slightly due to differences in local mass concentrations like dense rock formations.

Answer:

Reflection Questions:

1. I would already know the answer to the first essential question (evidence that Earth's gravitational force is downward toward its center).
2. I would need to learn more to confidently answer the second essential question (if gravity is the same across all Earth locations).

Essential Questions:

1. Evidence includes objects falling toward the ground, water flowing downhill, and plumb lines hanging toward Earth's interior, all showing gravity pulls toward the planet's center.
2. No, the force of gravity is not the same in all locations on Earth. It varies with altitude, latitude (due to Earth's oblate shape), and local geological features.